This changes VS to use the same library name as other platforms, since
the toolsets are binary-compatible going forward. This makes the build
script slightly more streamlined on windows.
Also enable building NSPR on windows as part of the spidermonkey build,
instead of compiling it separately.
Tested by: SubitaNeo, Stan
Refs #5859
Differential Revision: https://code.wildfiregames.com/D3115
This was SVN commit r24242.
wraitii
f2cf2c97ad